<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
  <style>
    .wrap {
      width: 100%;
      display: flex;
      margin: 0.2rem 0 0 0;
      position: relative;
    }
    
    /*左侧的导航样式*/
    .nav_left {
      width: 21.1875rem;
      overflow: scroll;
    }
    
    .nav_left::-webkit-scrollbar {
      display: none;
    }
    
    .nav_content {
      white-space: nowrap;
      padding: 0 0.7rem;
    }
    
    .nav_content span {
      display: inline-block;
      padding: 0.4rem 0.6rem;
      font-size: 0.875rem;
    }
    
    .nav_content .active {
      border-bottom: 2px solid #7f4395;
      color: #7f4395;
    }
    
    .nav_left,
    .down {
      float: left;
    }
    
    /*右侧导航部分*/
    .down {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .gray {
      color: gray;
      display: inline-block;
      vertical-align: middle;
    }
  </style>
</head>
<body>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="name"/>
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="age"/>
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item,index) in arr" :key="item.id">
          <td>{{index+1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.gender}}</td>
          <td>
            <button @click="del(item.id)">删除</button>
            <button @click="write(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        name:'',
        age: 0,
        gender:'',
        bian:true,
        bianIndex:0,
        arr :[
          {
          id:1,
          name:'王乐乐',
          age:18,
          gender:'男'
        },
     {
      id:2,
          name:'书本海',
          age:20,
          gender:'男'
     },
     {
      id:3,
          name:'陈什么的',
          age:22,
          gender:'男'
     },
      ]
      },
        methods:{
           add(){
            if(this.name === '') {
              return alert('请输入姓名')
            }
            if(typeof this.age !== 'number') {
              return alert('请输入正确的年龄')
            }
            if(this.bian) {
              this.arr.push({
                id:+new Date,
                name:this.name,
                age:this.age,
                gender:this.gender
              })
              this.name= ''
              this.age = ''
              this.gender = ''
            }  else {
                console.log('进来么')
                 this.arr[this.bianIndex] = {
                  id:this.arr[this.bianIndex].id,
                  name:this.name,
                  age:this.age,
                  gender:this.gender
                 }
                 this.name= ''
                 this.age = ''
                 this.gender = ''
                 this.bian = true
            }   
           },
           del(id){ 
            this.arr = this.arr.filter(item=>item.id !== id)
           },
           write(i){
               this.bian = false
               this.bianIndex = i
              this.name = this.arr[i].name
              this.age = this.arr[i].age
              this.gender = this.arr[i].gender
           }
        }
    })
  </script>
</body>
</html>